ch31 - Chapter 31 Nuclear Physics and Radioactivity 31.1...

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Chapter 31 Nuclear Physics and Radioactivity
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31.1 Nuclear Structure The atomic nucleus consists of positively charged protons and neutral neutrons.
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31.1 Nuclear Structure uu uu u uu uu u uu uu u neutrons of Number protons of Number neutrons and protons of Number N Z A + = atomic number atomic mass number
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31.1 Nuclear Structure Nuclei that contain the same number of protons but a different number of neutrons are known as isotopes .
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31.1 Nuclear Structure ( 29 3 1 15 m 10 2 . 1 A r - ×
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31.1 Nuclear Structure ( 29 3 1 15 m 10 2 . 1 A r - × Conceptual Example 1 Nuclear Density It is well known that lead and oxygen contain different atoms and that the density of solid lead is much greater than gaseous oxygen. Using the equation, decide whether the density of the nucleus in a lead atom is greater than, approximately equal to, or less than that in an oxygen atom.
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The Strong Nuclear Force and the Stability of the Nucleus The mutual repulsion of the protons tends to push the nucleus apart. What then, holds the nucleus together? The strong nuclear force.
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ch31 - Chapter 31 Nuclear Physics and Radioactivity 31.1...

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